Eligible participants were pregnant women between 18 and 40 years of age, with singleton pregnancy and gestation longer than 37 weeks, scheduled for elective cesarean section. Patients with fever and/or infectious conditions, a familial history of potential malignant hyperthermia, body mass index (BMI) values below 18.5 kg.cm-2 or above 36 kg.cm-2, thyroid disorders, dysautonomia, Raynaud's syndrome, and those in labor were excluded.